Includes an alligator clip for occasions when a grounded banana jack is not available (NOTE: Wrist strap kits include an alligator clip for occasions when a grounded banana jack is not available. However, the best industry practice is that ESD Ground Connections should be firm fitting connecting devices such as metallic crimps, snaps and banana plugs to be connected to designated ground points. Use of alligator clips is not recommended. (Ref: JEDEC Standard No. 625-A) )

What the ESD Association says about testing wrist straps:

Per ESD Handbook TR20.20 section 5.3.9.1Wrist Strap Checkers - “Wrist strap checkers have historically been the primary tool for testing the operation of the wrist strap system including, the wristband, grounding cord and most importantly, the electrical integrity of the contact between the wristband and the wearer. Wrist strap checkers measure the resistance of the entire system.”